The decay constant of the end product of a radioactive series is

Explain the conservation of linear momentum for the radioactive decay of a radium nucleus.

$\alpha$-decay of a parent nucleus $X$ results in a daughter nucleus $Y$. If $m_x, m_y$ and $m_a$ are the masses of the parent nucleus, the daughter nucleus and the $\alpha$-particle respectively, then the net kinetic energy gained in the process is:

Which of the following processes represents a gamma-decay?

Arrange the radioactive radiations in increasing order of their ionizing power and penetrating power.

Which of the following can pass through $20 \, cm$ thickness of steel?